内八边形中空钢筋混凝土柱抗冲击性能试验研究

Experimental study on impact resistance performance of inner-octagon hollow reinforced concrete columns

以内八边形中空钢筋混凝土柱为研究对象,利用大型落锤试验机完成了10根柱的撞击试验。试验中观察了内八边形中空钢筋混凝土柱的破坏形态,记录了冲击力时程曲线和跨中位移时程曲线。研究讨论了冲击能量、边界条件、轴力等参数对内八边形中空钢筋混凝土柱在冲击荷载作用下力学性能的影响规律。试验结果表明,内八边形中空钢筋混凝土柱具有良好的抗冲击性能;边界条件相同时,随着冲击能量的增加,冲击力峰值、跨中最大位移以及冲击持续时间随之增加;在相同冲击高度时,轴压力的改变对试件抗冲击性能有一定影响。

Ten impact tests of the inner-octagon hollow reinforced concrete columns were conducted in large-scale drop hammer imparter.The time-history curves of impact force and mid-span deflection were recorded,and the failure modes of the specimen were observed during the test.Effects of the parameters,such as impact energy,boundary conditions and axial force,on the mechanical behavior of inner-octagon hollow reinforced concrete columns under impact loads were discussed.The tests results indicate that the inner-octagon hollow reinforced concrete columns show good impact resistance performance;when the boundary conditions are the same,the peak value of impact force and the mid-span maximum deflection and the impact duration increase with the increase of impact energy;the axial compressive load has some influence on impact resistance performance when the impact height is same.